How do Pinhole glasses work?
For a person to see images clearly, the light rays entering the eye must come to a focus on the retina at the back of the eye. People who have blurry vision, for whatever reason, cannot see images clearly because the light rays entering the eye focus either in front of the retina or behind it. The pinhole lenses work by letting into the eye only the rays which pass through the center portion of the pupil, blocking out all the rest. It produces a slightly darker image, but all of the light rays entering the eye focus directly on the retina. There is no blur, just a clear, focused image. • Who do Pinhole Glasses work for? Almost anyone who has blurry vision can see clearly with the Pinhole Glasses. They work for people who suffer from eye strain, nearsightedness, farsightedness, cataracts, astigmatism, and even for people who have farsightedness associated with middle-age (presbyopia). They do not work well for people who suffer from visual defects greater than 6 diopters, and they are n
